$30 for Mulan is completely ordinary pricing for premier VoD.
You will get it on D+ 'for free' after it goes through various 'windows' of sales: theater, VoD, cable, broadcast, streamers. That is exactly what would happen if Mulan went to theaters first. Completely ordinary.
If you wanted to see it in theaters, $30 represents less than a family of three. Buy 'buying' it on VoD, you can watch it with many more people and many times over.
If you don't want to pay extra for a premier views, just wait 3-6 months and it will be on D+ at no extra charge. Just like you have the option of not seeing in theaters, if it had gone to theaters.
Which is completely ordinary.
Let's say Mulan in Theaters is going to earn $400 Million, over 6 weeks. To match the same revenue, Disney will need to get 13.4 million households to rent the movie. If you assume Disney would have kept 70% of the gross, and with VOD Disney is keeping 100% of the purchase price, the total they need to match the revenue goes down to 9.3 million households..... Doesn't seem like that big of a stretch. That's the bet.